<?php
// vim: set et ts=4 sw=4 fdm=marker:
// +----------------------------------------------------------------------+
// | PHP versions 4 and 5                                                 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2008 Manuel Lemos, Tomas V.V.Cox,                 |
// | Stig. S. Bakken, Lukas Smith                                         |
// | All rights reserved.                                                 |
// +----------------------------------------------------------------------+
// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB  |
// | API as well as database abstraction for PHP applications.            |
// | This LICENSE is in the BSD license style.                            |
// |                                                                      |
// | Redistribution and use in source and binary forms, with or without   |
// | modification, are permitted provided that the following conditions   |
// | are met:                                                             |
// |                                                                      |
// | Redistributions of source code must retain the above copyright       |
// | notice, this list of conditions and the following disclaimer.        |
// |                                                                      |
// | Redistributions in binary form must reproduce the above copyright    |
// | notice, this list of conditions and the following disclaimer in the  |
// | documentation and/or other materials provided with the distribution. |
// |                                                                      |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken,    |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission.                                                  |
// |                                                                      |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT    |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    |
// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE      |
// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,          |
// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
// |  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED  |
// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT          |
// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE          |
// | POSSIBILITY OF SUCH DAMAGE.                                          |
// +----------------------------------------------------------------------+
// | Authors: Paul Cooper <pgc@ucecom.com>                                |
// |          Lukas Smith <smith@pooteeweet.org>                          |
// |          Olivier Desmares <ingres@ascolteo.fr>                       |
// +----------------------------------------------------------------------+
//
// $Id: ingres.php 417 2009-05-29 14:00:00Z Alexander.Anokhin $

/**
 * MDB2 Ingres driver
 *
 * @package MDB2
 * @category Database
 * @author  Paul Cooper <pgc@ucecom.com>
 * @author  Lukas Smith <smith@pooteeweet.org>
 * @author  Oliver Desmares <ingres@ascolteo.fr>
 */
class MDB2_Driver_ingres extends MDB2_Driver_Common
{
	// {{{ properties
	var $string_quoting = array('start' => "'", 'end' => "'", 'escape' => "'", 'escape_pattern' => '\\');

	var $identifier_quoting = array('start' => '"', 'end' => '"', 'escape' => '"');
	// }}}
	// {{{ constructor

	/**
	 * Constructor
	 */
	function __construct()
	{
		parent::__construct();

		$this->phptype = 'ingres';
		$this->dbsyntax = 'ingres';

		$this->supported['sequences'] = true;
		$this->supported['indexes'] = true;
		$this->supported['affected_rows'] = true;
		$this->supported['summary_functions'] = true;
		$this->supported['order_by_text'] = true;
		$this->supported['transactions'] = true;
		$this->supported['savepoints'] = false;
		$this->supported['current_id'] = true;
		$this->supported['limit_queries'] = true;
		$this->supported['LOBs'] = true;
		$this->supported['replace'] = 'emulated';
		$this->supported['sub_selects'] = true;
		$this->supported['triggers'] = true;
		$this->supported['auto_increment'] = 'emulated';
		$this->supported['primary_key'] = true;
		$this->supported['result_introspection'] = true;
		$this->supported['prepared_statements'] = true;
		$this->supported['identifier_quoting'] = true;
		$this->supported['pattern_escaping'] = true;
		$this->supported['new_link'] = true;

		$this->options['DBA_username'] = false;
		$this->options['DBA_password'] = false;
		$this->options['multi_query'] = false;
		$this->options['disable_smart_seqname'] = false;
		$this->options['max_identifiers_length'] = 32;
	}

	// }}}
	// {{{ errorInfo()

	/**
	 * This method is used to collect information about an error
	 *
	 * @param integer $error
	 * @return array
	 * @access public
	 */
	function errorInfo($error = null)
	{
		// Fall back to MDB2_ERROR if there was no mapping.
		$error_code = MDB2_ERROR;

		$native_msg = '';
		if (is_resource($error)) {
			$native_msg = ingres_error($error);
		} elseif ($this->connection) {
			$native_msg = ingres_error($this->connection);
		} else {
			$native_msg = ingres_error();
		}

		static $error_regexps;
		if (empty($error_regexps)) {
			$error_regexps = array(
                "/e_us0836 column '.*' not found/i"
                => MDB2_ERROR_NOSUCHFIELD,
                "/'.*' does not exist/i"
                => MDB2_ERROR_NOSUCHTABLE,
                "/e_us1914 .* sequence '.*'/i"
                => MDB2_ERROR_NOSUCHTABLE,
                "/e_qe00a2 an attempt/i"
                => MDB2_ERROR_INVALID,
                "/database does not exist: '.*'/"
                => MDB2_ERROR_NOT_FOUND,
                "/drop: '.*' does not exist or is not owned by you/i"
                => MDB2_ERROR_NOT_FOUND,
                '/already exists/i'
                => MDB2_ERROR_ALREADY_EXISTS,
                "/duplicate object name '.*'/i"
                => MDB2_ERROR_ALREADY_EXISTS,
                '/(divide|division) by zero$/i'
                => MDB2_ERROR_DIVZERO,
                '/illegal character to integer conversion/i'
                => MDB2_ERROR_INVALID_NUMBER,
                '/integer overflow detected/i'
                => MDB2_ERROR_INVALID_NUMBER,
                '/column .* specified in USING clause does not exist in (left|right) table/i'
                => MDB2_ERROR_NOSUCHFIELD,
                '/syntax error on/'
                => MDB2_ERROR_SYNTAX,
                '/from clause is mandatory/'
                => MDB2_ERROR_SYNTAX,
                "/column '.*' found in more than one from list table/i"
                => MDB2_ERROR_SYNTAX,
                '/permission denied/'
                => MDB2_ERROR_ACCESS_VIOLATION,
                '/violates not-null constraint/'
                => MDB2_ERROR_CONSTRAINT_NOT_NULL,
                '/violates [\w ]+ constraint/'
                => MDB2_ERROR_CONSTRAINT,
                '/referential integrity violation/'
                => MDB2_ERROR_CONSTRAINT,
                '/number of target columns must equal the number of/i'
                => MDB2_ERROR_VALUE_COUNT_ON_ROW,
                );
		}
		if (is_numeric($error) && $error < 0) {
			$error_code = $error;
		} else {
			foreach ($error_regexps as $regexp => $code) {
				if (preg_match($regexp, $native_msg)) {
					$error_code = $code;
					break;
				}
			}
		}
		return array($error_code, null, $native_msg);
	}

	// }}}
	// {{{ escape()

	/**
	 * Quotes a string so it can be safely used in a query. It will quote
	 * the text so it can safely be used within a query.
	 *
	 * @param   string  the input string to quote
	 * @param   bool    escape wildcards
	 *
	 * @return  string  quoted string
	 *
	 * @access  public
	 */
	function escape($text, $escape_wildcards = false)
	{
		if ($escape_wildcards) {
			$text = $this->escapePattern($text);
		}
		$connection = $this->getConnection();
		if (PEAR::isError($connection)) {
			return $connection;
		}
		$text = @addslashes($text);
		return $text;
	}

	// }}}
	// {{{ beginTransaction()

	/**
	 * Start a transaction or set a savepoint.
	 *
	 * @param   string  name of a savepoint to set
	 * @return  mixed   MDB2_OK on success, a MDB2 error on failure
	 *
	 * @access  public
	 */
	function beginTransaction($savepoint = null)
	{
		$this->debug('Starting transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
		if (!is_null($savepoint)) {
			if (!$this->in_transaction) {
				return $this->raiseError(MDB2_ERROR_INVALID, null, null,
                    'savepoint cannot be released when changes are auto committed', __FUNCTION__);
			}
			$query = 'SAVEPOINT '.$savepoint;
			return $this->_doQuery($query, true);
		} elseif ($this->in_transaction) {
			return MDB2_OK;  //nothing to do
		} else {
			$connection = $this->getConnection();
			if (PEAR::isError($connection)) {
				return $connection;
			}
			if (ingres_autocommit($connection) === false) {
				return $this->raiseError(MDB2_ERROR, null, null,
                    'unable to set autocommit off', __FUNCTION__);
			}
		}
		if (!$this->destructor_registered && $this->opened_persistent) {
			$this->destructor_registered = true;
			register_shutdown_function('MDB2_closeOpenTransactions');
		}
		$this->in_transaction = true;
		return MDB2_OK;
	}

	// }}}
	// {{{ commit()

	/**
	 * Commit the database changes done during a transaction that is in
	 * progress or release a savepoint. This function may only be called when
	 * auto-committing is disabled, otherwise it will fail. Therefore, a new
	 * transaction is implicitly started after committing the pending changes.
	 *
	 * @param   string  name of a savepoint to release
	 * @return  mixed   MDB2_OK on success, a MDB2 error on failure
	 *
	 * @access  public
	 */
	function commit($savepoint = null)
	{
		$this->debug('Committing transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
		if (!$this->in_transaction) {
			return $this->raiseError(MDB2_ERROR_INVALID, null, null,
                'commit/release savepoint cannot be done changes are auto committed', __FUNCTION__);
		}

		$connection = $this->getConnection();
		if (PEAR::isError($connection)) {
			return $connection;
		}
		if (ingres_commit($connection) === false) {
			return $this->raiseError(MDB2_ERROR, null, null,
                'unable to commit', __FUNCTION__);
		}
		if (ingres_autocommit($connection) === false) {
			return $this->raiseError(MDB2_ERROR, null, null,
                'unable to set autocommit on', __FUNCTION__);
		}
		$this->in_transaction = false;
		return MDB2_OK;
	}

	// }}}
	// {{{ rollback()

	/**
	 * Cancel any database changes done during a transaction or since a specific
	 * savepoint that is in progress. This function may only be called when
	 * auto-committing is disabled, otherwise it will fail. Therefore, a new
	 * transaction is implicitly started after canceling the pending changes.
	 *
	 * @param   string  name of a savepoint to rollback to
	 * @return  mixed   MDB2_OK on success, a MDB2 error on failure
	 *
	 * @access  public
	 */
	function rollback($savepoint = null)
	{
		$this->debug('Rolling back transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
		if (!$this->in_transaction) {
			return $this->raiseError(MDB2_ERROR_INVALID, null, null,
                'rollback cannot be done changes are auto committed', __FUNCTION__);
		}
		if (!is_null($savepoint)) {
			$query = 'ROLLBACK TO '.$savepoint;
			return $this->_doQuery($query, true);
		}

		$connection = $this->getConnection();
		if (PEAR::isError($connection)) {
			return $connection;
		}
		if (ingres_rollback($connection) === false) {
			return $this->raiseError(MDB2_ERROR, null, null,
                'unable to rollback', __FUNCTION__);
		}
		if (ingres_autocommit($connection) === false) {
			return $this->raiseError(MDB2_ERROR, null, null,
                'unable to set autocommit on', __FUNCTION__);
		}
		$this->in_transaction = false;
		return MDB2_OK;
	}

	// }}}
	// {{{ function setTransactionIsolation()

	/**
	 * Set the transacton isolation level.
	 *
	 * @param   string  standard isolation level
	 *                  READ UNCOMMITTED (allows dirty reads)
	 *                  READ COMMITTED (prevents dirty reads)
	 *                  REPEATABLE READ (prevents nonrepeatable reads)
	 *                  SERIALIZABLE (prevents phantom reads)
	 * @return  mixed   MDB2_OK on success, a MDB2 error on failure
	 *
	 * @access  public
	 * @since   2.1.1
	 */
	function setTransactionIsolation($isolation)
	{
		$this->debug('Setting transaction isolation level', __FUNCTION__, array('is_manip' => true));
		switch ($isolation) {
			case 'READ UNCOMMITTED':
			case 'READ COMMITTED':
			case 'REPEATABLE READ':
			case 'SERIALIZABLE':
				break;
			default:
				return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
                'isolation level is not supported: '.$isolation, __FUNCTION__);
		}

		$query = "SET SESSION TRANSACTION ISOLATION LEVEL $isolation";
		return $this->_doQuery($query, true);
	}

	// }}}
	// {{{ _doConnect()

	/**
	 * Do the grunt work of connecting to the database
	 *
	 * @return mixed connection resource on success, MDB2 Error Object on failure
	 * @access protected
	 */
	function _doConnect($username, $password, $database_name, $persistent = false)
	{
		if (!PEAR::loadExtension($this->phptype)) {
			return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                'extension '.$this->phptype.' is not compiled into PHP', __FUNCTION__);
		}

		$protocol = $this->dsn['protocol'] ? $this->dsn['protocol'] : 'tcp';

		$params = array(NULL,NULL,NULL);
		if ($protocol == 'tcp') {
			if ($this->dsn['hostspec']) {
				$params[0] = $this->dsn['hostspec'].'::';
			}
		}
		if ($database_name) {
			$params[0].= addslashes($database_name);
		}
		else {
			$params[0].='iidbdb';
		}
		if ($username) {
			$params[1] = addslashes($username);
		}
		if ($password) {
			$params[2] = addslashes($password);
		}

		if (empty($this->dsn['disable_iso_date'])) {
			$options['date_format'] = INGRES_DATE_ISO;
		}
		
		if (!empty($this->dsn['options'])) {
			$optionList = explode(" ",$this->dsn['options']);
			foreach($optionList as $optionItem) {
				$optionExpr = explode("=",$optionItem);
				if ($optionExpr[0] == 'date_format')
				$options[$optionExpr[0]] = (int)$optionExpr[1];
				else $options[$optionExpr[0]] = $optionExpr[1];
			}
		}

		$params[3]=$options;

		$connect_function = $persistent ? 'ingres_pconnect' : 'ingres_connect';
		 
		$connection = @call_user_func_array($connect_function, $params);
		if (!$connection) {
			return $this->raiseError(MDB2_ERROR_CONNECT_FAILED, null, null,
                'unable to establish a connection', __FUNCTION__);
		}

		$ac_state = ingres_autocommit_state($connection);
		if ($ac_state === false) {
			if (ingres_autocommit($connection) === false) {
				return $this->raiseError(MDB2_ERROR, null, null,
                    'unable to set autocommit on', __FUNCTION__);
			}
		}

		/***
		 ***/

		if (!empty($this->dsn['charset'])) {
			$result = $this->setCharset($this->dsn['charset'], $connection);
			if (PEAR::isError($result)) {
				return $result;
			}
		}

		return $connection;
	}

	// }}}
	// {{{ connect()

	/**
	 * Connect to the database
	 *
	 * @return true on success, MDB2 Error Object on failure
	 * @access public
	 */
	function connect()
	{
		if (is_resource($this->connection)) {
			if ((count(array_diff($this->connected_dsn, $this->dsn)) == 0)
			&& $this->connected_database_name == $this->database_name
			&& ($this->opened_persistent == $this->options['persistent'])
			) {
				return MDB2_OK;
			}
			$this->disconnect(false);
		}

		if ($this->database_name) {
			$connection = $this->_doConnect($this->dsn['username'],
			$this->dsn['password'],
			$this->database_name,
			$this->options['persistent']);
			if (PEAR::isError($connection)) {
				return $connection;
			}

			$this->connection = $connection;
			$this->connected_dsn = $this->dsn;
			$this->connected_database_name = $this->database_name;
			$this->opened_persistent = $this->options['persistent'];
			$this->dbsyntax = $this->dsn['dbsyntax'] ? $this->dsn['dbsyntax'] : $this->phptype;
		}

		return MDB2_OK;
	}

	// }}}
	// {{{ setCharset()

	/**
	 * Set the charset on the current connection
	 *
	 * @param string    charset
	 * @param resource  connection handle
	 *
	 * @return true on success, MDB2 Error Object on failure
	 */
	function setCharset($charset, $connection = null)
	{
		if (is_null($connection)) {
			$connection = $this->getConnection();
			if (PEAR::isError($connection)) {
				return $connection;
			}
		}
		return $this->raiseError(null, null, null,
                'Ingres does not support setting client charset', __FUNCTION__);
	}

	// }}}
	// {{{ databaseExists()

	/**
	 * check if given database name is exists?
	 *
	 * @param string $name    name of the database that should be checked
	 *
	 * @return mixed true/false on success, a MDB2 error on failure
	 * @access public
	 */
	function databaseExists($name)
	{
		$res = $this->_doConnect($this->dsn['username'],
		$this->dsn['password'],
		$this->escape($name),
		$this->options['persistent']);
		if (!PEAR::isError($res)) {
			return true;
		}

		return false;
	}

	// }}}
	// {{{ disconnect()

	/**
	 * Log out and disconnect from the database.
	 *
	 * @param  boolean $force if the disconnect should be forced even if the
	 *                        connection is opened persistently
	 * @return mixed true on success, false if not connected and error
	 *                object on error
	 * @access public
	 */
	function disconnect($force = true)
	{
		if (is_resource($this->connection)) {
			if ($this->in_transaction) {
				$dsn = $this->dsn;
				$database_name = $this->database_name;
				$persistent = $this->options['persistent'];
				$this->dsn = $this->connected_dsn;
				$this->database_name = $this->connected_database_name;
				$this->options['persistent'] = $this->opened_persistent;
				$this->rollback();
				$this->dsn = $dsn;
				$this->database_name = $database_name;
				$this->options['persistent'] = $persistent;
			}

			if (!$this->opened_persistent || $force) {
				ingres_close($this->connection);
			}
		}
		return parent::disconnect($force);
	}

	// }}}
	// {{{ standaloneQuery()

	/**
	 * execute a query as DBA
	 *
	 * @param string $query the SQL query
	 * @param mixed   $types  array that contains the types of the columns in
	 *                        the result set
	 * @param boolean $is_manip  if the query is a manipulation query
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function &standaloneQuery($query, $types = null, $is_manip = false)
	{
		$user = $this->options['DBA_username']? $this->options['DBA_username'] : $this->dsn['username'];
		$pass = $this->options['DBA_password']? $this->options['DBA_password'] : $this->dsn['password'];
		$connection = $this->_doConnect($user, $pass, $this->database_name, $this->options['persistent']);
		if (PEAR::isError($connection)) {
			return $connection;
		}

		$offset = $this->offset;
		$limit = $this->limit;
		$this->offset = $this->limit = 0;
		$query = $this->_modifyQuery($query, $is_manip, $limit, $offset);

		$result =& $this->_doQuery($query, $is_manip, $connection, $this->database_name);
		if (!PEAR::isError($result)) {
			if ($is_manip) {
				$result =  $this->_affectedRows($connection, $result);
			} else {
				$result =& $this->_wrapResult($result, $types, true, false, $limit, $offset);
			}
		}

		ingres_close($connection);
		return $result;
	}

	// }}}
	// {{{ _doQuery()

	/**
	 * Execute a query
	 * @param string $query  query
	 * @param boolean $is_manip  if the query is a manipulation query
	 * @param resource $connection
	 * @param string $database_name
	 * @return result or error object
	 * @access protected
	 */
	function &_doQuery($query, $is_manip = false, $connection = null, $database_name = null)
	{
		$this->last_query = $query;
		$result = $this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'pre'));
		if ($result) {
			if (PEAR::isError($result)) {
				return $result;
			}
			$query = $result;
		}
		if ($this->options['disable_query']) {
			$result = $is_manip ? 0 : null;
			return $result;
		}

		if (is_null($connection)) {
			$connection = $this->getConnection();
			if (PEAR::isError($connection)) {
				return $connection;
			}
		}

		if ($this->options['multi_query']) {
			$this->warnings[] = 'Ingres does not support multi-query';
		}

		$function = 'ingres_query';
		$result = $function($connection, $query);
		if (!$result) {
			$err =& $this->raiseError(null, null, null,
                'Could not execute statement', __FUNCTION__);
			return $err;
		}

		$this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'post', 'result' => $result));
		return $result;
	}

	// }}}
	// {{{ _affectedRows()

	/**
	 * Returns the number of rows affected
	 *
	 * @param resource $result
	 * @param resource $connection
	 * @return mixed MDB2 Error Object or the number of rows affected
	 * @access private
	 */
	function _affectedRows($connection, $result = null)
	{
		if (is_null($connection)) {
			$connection = $this->getConnection();
			if (PEAR::isError($connection)) {
				return $connection;
			}
		}
		return ingres_num_rows($result);
	}

	// }}}
	// {{{ _modifyQuery()

	/**
	 * Changes a query string for various DBMS specific reasons
	 *
	 * @param string $query  query to modify
	 * @param boolean $is_manip  if it is a DML query
	 * @param integer $limit  limit the number of rows
	 * @param integer $offset  start reading from given offset
	 * @return string modified query
	 * @access protected
	 */
	function _modifyQuery($query, $is_manip, $limit, $offset)
	{
		if ($limit > 0 && FALSE === strpos($query,'FIRST'))
		{
			$query = rtrim($query);
			if (substr($query, -1) == ';') {
				$query = substr($query, 0, -1);
			}
			if ($is_manip) {
				$query = $this->_modifyManipQuery($query, $limit);
			} else {
				$query .= " OFFSET {$offset} FETCH FIRST {$limit} ROWS ONLY";
			}
		}
		return $query;
	}

	// }}}
	// {{{ _modifyManipQuery()

	/**
	 * Changes a manip query string for various DBMS specific reasons
	 *
	 * @param string $query  query to modify
	 * @param integer $limit  limit the number of rows
	 * @return string modified query
	 * @access protected
	 */
	function _modifyManipQuery($query, $limit)
	{
		$pos = strpos(strtolower($query), 'where');
		$where = $pos ? substr($query, $pos) : '';

		$manip_clause = '(\bDELETE\b\s+(?:\*\s+)?\bFROM\b|\bUPDATE\b)';
		$from_clause  = '([\w\.]+)';
		$where_clause = '(?:(.*)\bWHERE\b\s+(.*))|(.*)';
		$pattern = '/^'. $manip_clause . '\s+' . $from_clause .'(?:\s)*(?:'. $where_clause .')?$/i';
		$matches = preg_match($pattern, $query, $match);
		if ($matches) {
			$manip = $match[1];
			$from  = $match[2];
			$what  = (count($matches) == 6) ? $match[5] : $match[3];
			return $manip.' '.$from.' '.$what.' WHERE ctid=(SELECT ctid FROM '.$from.' '.$where.' LIMIT '.$limit.')';
		}
		//return error?
		return $query;
	}

	// }}}
	// {{{ getServerVersion()

	/**
	 * return version information about the server
	 *
	 * @param bool   $native  determines if the raw version string should be returned
	 * @return mixed array/string with version information or MDB2 error object
	 * @access public
	 */
	function getServerVersion($native = false)
	{
		$query = "select cap_value from iidbcapabilities where cap_capability='INGRES/SQL_LEVEL'";
		if ($this->connected_server_info) {
			$server_info = $this->connected_server_info;
		} else {
			$server_info = $this->queryOne($query, 'text', ini_get('ingres.array_index_start'));
			if (PEAR::isError($server_info)) {
				return $server_info;
			}
		}
		// cache server_info
		$this->connected_server_info = $server_info;
		if (!$native && !PEAR::isError($server_info)) {
			$major = substr($server_info,0,-1);
			$minor = substr($server_info,-1);
			switch($major) {
				case '0060':
					if ($minor!=5) {
						$server_name = "6." . $minor;
					} else {
						$server_name = 'OpenIngres 1.x';
					}
					break;
				case '0080':
					$server_name = 'OpenIngres 2.0 / Ingres II 2.0';
					break;
				case '0085':
					$server_name = 'Ingres II 2.5';
					break;
				case '0086':
					$server_name = 'Ingres 2.6';
					break;
				case '0090':
					if ($minor==2) {
						$server_name = 'Ingres r3';
					} else if ($minor==4) {
						$server_name = 'Ingres 2006';
					} else {
						$server_name='unknown';
					}
					break;
				case '0091':
					$server_name = 'Ingres 2006 r2 9.1.' . $minor;
					break;
				case '0092':
					$server_name = 'Ingres 2006 r3 9.2.' . $minor;
					break;
				default:
					$server_name='unknown';
			}

			$server_info = array(
                'name' => $server_name,
                'native' => $server_info,
			);
		}
		return $server_info;
	}

	// }}}
	// {{{ prepare()

	/**
	 * Prepares a query for multiple execution with execute().
	 * With some database backends, this is emulated.
	 * prepare() requires a generic query as string like
	 * 'INSERT INTO numbers VALUES(?,?)' or
	 * 'INSERT INTO numbers VALUES(:foo,:bar)'.
	 * The ? and :name and are placeholders which can be set using
	 * bindParam() and the query can be sent off using the execute() method.
	 * The allowed format for :name can be set with the 'bindname_format' option.
	 *
	 * @param string $query the query to prepare
	 * @param mixed   $types  array that contains the types of the placeholders
	 * @param mixed   $result_types  array that contains the types of the columns in
	 *                        the result set or MDB2_PREPARE_RESULT, if set to
	 *                        MDB2_PREPARE_MANIP the query is handled as a manipulation query
	 * @param mixed   $lobs   key (field) value (parameter) pair for all lob placeholders
	 * @return mixed resource handle for the prepared query on success, a MDB2
	 *        error on failure
	 * @access public
	 * @see bindParam, execute
	 */
	function &prepare($query, $types = null, $result_types = null, $lobs = array())
	{
		if ($this->options['emulate_prepared']) {
			$obj =& parent::prepare($query, $types, $result_types, $lobs);
			return $obj;
		}
		$is_manip = ($result_types === MDB2_PREPARE_MANIP);
		$offset = $this->offset;
		$limit = $this->limit;
		$this->offset = $this->limit = 0;
		$result = $this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'pre'));
		if ($result) {
			if (PEAR::isError($result)) {
				return $result;
			}
			$query = $result;
		}
		$pgtypes = function_exists('ingres_prepare') ? false : array();
		if ($pgtypes !== false && !empty($types)) {
			$this->loadModule('Datatype', null, true);
		}
		$query = $this->_modifyQuery($query, $is_manip, $limit, $offset);
		$placeholder_type_guess = $placeholder_type = null;
		$question = '?';
		$colon = ':';
		$positions = array();
		$position = $parameter = 0;
		while ($position < strlen($query)) {
			$q_position = strpos($query, $question, $position);
			$c_position = strpos($query, $colon, $position);
			//skip "::type" cast ("select id::varchar(20) from sometable where name=?")
			$doublecolon_position = strpos($query, '::', $position);
			if ($doublecolon_position !== false && $doublecolon_position == $c_position) {
				$c_position = strpos($query, $colon, $position+2);
			}
			if ($q_position && $c_position) {
				$p_position = min($q_position, $c_position);
			} elseif ($q_position) {
				$p_position = $q_position;
			} elseif ($c_position) {
				$p_position = $c_position;
			} else {
				break;
			}
			if (is_null($placeholder_type)) {
				$placeholder_type_guess = $query[$p_position];
			}

			$new_pos = $this->_skipDelimitedStrings($query, $position, $p_position);
			if (PEAR::isError($new_pos)) {
				return $new_pos;
			}
			if ($new_pos != $position) {
				$position = $new_pos;
				continue; //evaluate again starting from the new position
			}

			if ($query[$position] == $placeholder_type_guess) {
				if (is_null($placeholder_type)) {
					$placeholder_type = $query[$p_position];
					$question = $colon = $placeholder_type;
					if (!empty($types) && is_array($types)) {
						if ($placeholder_type == ':') {
						} else {
							$types = array_values($types);
						}
					}
				}
				if ($placeholder_type_guess == '?') {
					$length = 1;
					$name = $parameter;
				} else {
					$regexp = '/^.{'.($position+1).'}('.$this->options['bindname_format'].').*$/s';
					$param = preg_replace($regexp, '\\1', $query);
					if ($param === '') {
						$err =& $this->raiseError(MDB2_ERROR_SYNTAX, null, null,
                            'named parameter name must match "bindname_format" option', __FUNCTION__);
						return $err;
					}
					$length = strlen($param) + 1;
					$name = $param;
				}
				if ($pgtypes !== false) {
					if (is_array($types) && array_key_exists($name, $types)) {
						$pgtypes[] = $this->datatype->mapPrepareDatatype($types[$name]);
					} elseif (is_array($types) && array_key_exists($parameter, $types)) {
						$pgtypes[] = $this->datatype->mapPrepareDatatype($types[$parameter]);
					} else {
						$pgtypes[] = 'text';
					}
				}
				if (($key_parameter = array_search($name, $positions))) {
					$next_parameter = 1;
					foreach ($positions as $key => $value) {
						if ($key_parameter == $key) {
							break;
						}
						++$next_parameter;
					}
				} else {
					++$parameter;
					$next_parameter = $parameter;
					$positions[] = $name;
				}
				// $query = substr_replace($query, '$'.$parameter, $position, $length);
				$position = $p_position + strlen($parameter);
			} else {
				$position = $p_position;
			}
		}
		$connection = $this->getConnection();
		if (PEAR::isError($connection)) {
			return $connection;
		}
		static $prep_statement_counter = 1;
		$statement_name = sprintf($this->options['statement_format'], $this->phptype, $prep_statement_counter++ . sha1(microtime() + mt_rand()));
		$statement_name = substr(strtolower($statement_name), 0, $this->options['max_identifiers_length']);
		if ($pgtypes === false) {
			//echo "av prepare=".$query."\n";
			//$result = ingres_prepare($connection, $query);
			//$result = ingres_query($connection, $query);
			//echo "ap prepare res=".$result."\n";
			if ($result===FALSE) {
				$err =& $this->raiseError(null, null, null,
                    'Unable to create prepared statement handle', __FUNCTION__);
				return $err;
			}
			//echo "ap unable\n";
		} else {
			$types_string = '';
			if ($pgtypes) {
				$types_string = ' ('.implode(', ', $pgtypes).') ';
			}
			$query = 'PREPARE '.$statement_name.$types_string.' AS '.$query;
			$statement =& $this->_doQuery($query, true, $connection);
			if (PEAR::isError($statement)) {
				return $statement;
			}
		}
		//echo "av class\n";
		$class_name = 'MDB2_Statement_'.$this->phptype;
		$obj = new $class_name($this, $statement_name, $positions, $query, $types, $result_types, $is_manip, $limit, $offset);
		$this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'post', 'result' => $obj));
		//echo "ap class\n";
		return $obj;
	}

	// }}}
	// {{{ nextID()

	/**
	 * Returns the next free id of a sequence
	 *
	 * @param string $seq_name name of the sequence
	 * @param boolean $ondemand when true the sequence is
	 *                          automatic created, if it
	 *                          not exists
	 * @return mixed MDB2 Error Object or id
	 * @access public
	 */
	function nextID($seq_name, $ondemand = true)
	{
		$sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
		$query = "SELECT $sequence_name.NEXTVAL";
		$this->pushErrorHandling(PEAR_ERROR_RETURN);
		$this->expectError(MDB2_ERROR_NOSUCHTABLE);
		$result = $this->queryOne($query, 'integer', ini_get('ingres.array_index_start'));
		$this->popExpect();
		$this->popErrorHandling();
		if (PEAR::isError($result)) {
			if ($ondemand && $result->getCode() == MDB2_ERROR_NOSUCHTABLE) {
				$this->loadModule('Manager', null, true);
				$result = $this->manager->createSequence($seq_name);
				if (PEAR::isError($result)) {
					return $this->raiseError($result, null, null,
                        'on demand sequence could not be created', __FUNCTION__);
				}
				return $this->nextId($seq_name, false);
			}
		}
		return $result;
	}

	// }}}
	// {{{ lastInsertID()

	/**
	 * Returns the autoincrement ID if supported or $id or fetches the current
	 * ID in a sequence called: $table.(empty($field) ? '' : '_'.$field)
	 *
	 * @param string $table name of the table into which a new row was inserted
	 * @param string $field name of the field into which a new row was inserted
	 * @return mixed MDB2 Error Object or id
	 * @access public
	 */
	function lastInsertID($table = null, $field = null)
	{
		if (empty($table) && empty($field)) {
			return $this->queryOne('SELECT lastval()', 'integer', ini_get('ingres.array_index_start'));
		}
		$seq = $table.(empty($field) ? '' : '_'.$field);
		$sequence_name = $this->quoteIdentifier($this->getSequenceName($seq), true);
		return $this->queryOne("SELECT $sequence_name.CURRVAL", 'integer', ini_get('ingres.array_index_start'));
	}

	// }}}
	// {{{ currID()

	/**
	 * Returns the current id of a sequence
	 *
	 * @param string $seq_name name of the sequence
	 * @return mixed MDB2 Error Object or id
	 * @access public
	 */
	function currID($seq_name)
	{
		$sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
		return $this->queryOne("SELECT $sequence_name.CURRVAL", 'integer', ini_get('ingres.array_index_start'));
	}
	}

	/**
	 * MDB2 Ingres result driver
	 *
	 * @package MDB2
	 * @category Database
	 * @author  Paul Cooper <pgc@ucecom.com>
	 * @author  Lukas Smith <smith@pooteeweet.org>
	 * @author  Oliver Desmares <ingres@ascolteo.fr>
	 */
	class MDB2_Result_ingres extends MDB2_Result_Common
	{
		

		
		// }}}
		// {{{ fetchRow()

		/**
		 * Fetch a row and insert the data into an existing array.
		 *
		 * @param int       $fetchmode  how the array data should be indexed
		 * @param int    $rownum    number of the row where the data can be found
		 * @return int data array on success, a MDB2 error on failure
		 * @access public
		 */
		function &fetchRow($fetchmode = MDB2_FETCHMODE_DEFAULT, $rownum = null)
		{
			if (!is_null($rownum)) {
				$seek = $this->seek($rownum);
				if (PEAR::isError($seek)) {
					return $seek;
				}
			}
			if ($fetchmode == MDB2_FETCHMODE_DEFAULT) {
				$fetchmode = $this->db->fetchmode;
			}
			if ($fetchmode & MDB2_FETCHMODE_ASSOC) {
				$row = ingres_fetch_array($this->result,INGRES_NUM);
				if (is_array($row)
				&& $this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE
				) {
					$row = array_change_key_case($row, $this->db->options['field_case']);
				}
			} else {
				$row = ingres_fetch_row($this->result);
				var_dump($row); die();
			}
			if (!$row) {
				if ($this->result === false) {
					$err =& $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
                    'resultset has already been freed', __FUNCTION__);
					return $err;
				}
				$null = null;
				return $null;
			}
			$mode = $this->db->options['portability'] & MDB2_PORTABILITY_EMPTY_TO_NULL;
			$rtrim = false;
			if ($this->db->options['portability'] & MDB2_PORTABILITY_RTRIM) {
				if (empty($this->types)) {
					$mode += MDB2_PORTABILITY_RTRIM;
				} else {
					$rtrim = true;
				}
			}
			if ($mode) {
				$this->db->_fixResultArrayValues($row, $mode);
			}
			if (!empty($this->types)) {
				$row = $this->db->datatype->convertResultRow($this->types, $row, $rtrim);
			}
			if (!empty($this->values)) {
				$this->_assignBindColumns($row);
			}
			if ($fetchmode === MDB2_FETCHMODE_OBJECT) {
				$object_class = $this->db->options['fetch_class'];
				if ($object_class == 'stdClass') {
					$row = (object) $row;
				} else {
					$row = &new $object_class($row);
				}
			}
			++$this->rownum;
			return $row;
		}
		

		// }}}
		// {{{ _getColumnNames()

		/**
		 * Retrieve the names of columns returned by the DBMS in a query result.
		 *
		 * @return  mixed   Array variable that holds the names of columns as keys
		 *                  or an MDB2 error on failure.
		 *                  Some DBMS may not return any columns when the result set
		 *                  does not contain any rows.
		 * @access private
		 */
		function _getColumnNames()
		{
			$columns = array();
			$numcols = $this->numCols();
			if (PEAR::isError($numcols)) {
				return $numcols;
			}
			for ($column = 0; $column < $numcols; $column++) {
				$column_name = ingres_field_name($this->result, $column+1);
				$columns[$column_name] = $column;
			}
			if ($this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
				$columns = array_change_key_case($columns, $this->db->options['field_case']);
			}
			return $columns;
		}

		// }}}
		// {{{ numCols()

		/**
		 * Count the number of columns returned by the DBMS in a query result.
		 *
		 * @access public
		 * @return mixed integer value with the number of columns, a MDB2 error
		 *                       on failure
		 */
		function numCols()
		{
			$cols = ingres_num_fields($this->result);
			if (is_null($cols)) {
				if ($this->result === false) {
					return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
                    'resultset has already been freed', __FUNCTION__);
				} elseif (is_null($this->result)) {
					return count($this->types);
				}
				return $this->db->raiseError(null, null, null,
                'Could not get column count', __FUNCTION__);
			}
			return $cols;
		}

		// }}}
		// {{{ nextResult()

		/**
		 * Move the internal result pointer to the next available result
		 *
		 * @return true on success, false if there is no more result set or an error object on failure
		 * @access public
		 */
		function nextResult()
		{
			return $this->db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            'Ingres does not support concurrent queries', __FUNCTION__);
		}

		// }}}
		// {{{ free()

		/**
		 * Free the internal resources associated with result.
		 *
		 * @return boolean true on success, false if result is invalid
		 * @access public
		 */
		function free()
		{
			if (is_object($this->result) && $this->db->connection) {
				$free = ingres_free_result($this->result);
				if ($free === false) {
					return $this->db->raiseError(null, null, null,
                    'Could not free result', __FUNCTION__);
				}
			}
			$this->result = false;
			return MDB2_OK;
		}
	}

	/**
	 * MDB2 Ingres buffered result driver
	 *
	 * @package MDB2
	 * @category Database
	 * @author  Paul Cooper <pgc@ucecom.com>
	 * @author  Lukas Smith <smith@pooteeweet.org>
	 * @author  Oliver Desmares <ingres@ascolteo.fr>
	 */
	class MDB2_BufferedResult_ingres extends MDB2_Result_ingres
	{
		function fetch($select)
		{
			die();
			return $this->db->query($select);
		}
				
		public function setFetchMode($mode)
		{
			$this->db->fetchmode = $mode;
		}
		
		// }}}
		// {{{ seek()

		/**
		 * Seek to a specific row in a result set
		 *
		 * @param int    $rownum    number of the row where the data can be found
		 * @return mixed MDB2_OK on success, a MDB2 error on failure
		 * @access public
		 */
		function seek($rownum = 0)
		{
			return $this->db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            'Ingres does not support concurrent queries', __FUNCTION__);
		}

		// }}}
		// {{{ valid()

		/**
		 * Check if the end of the result set has been reached
		 *
		 * @return mixed true or false on sucess, a MDB2 error on failure
		 * @access public
		 */
		function valid()
		{
			$numrows = $this->numRows();
			if (PEAR::isError($numrows)) {
				return $numrows;
			}
			return $this->rownum < ($numrows - 1);
		}

		// }}}
		// {{{ numRows()

		/**
		 * Returns the number of rows in a result object
		 *
		 * @return mixed MDB2 Error Object or the number of rows
		 * @access public
		 */
		function numRows()
		{
			$rows = ingres_num_rows($this->result);
			if (is_null($rows)) {
				if ($this->result === false) {
					return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
                    'resultset has already been freed', __FUNCTION__);
				} elseif (is_null($this->result)) {
					return 0;
				}
				return $this->db->raiseError(null, null, null,
                'Could not get row count', __FUNCTION__);
			}
			return $rows;
		}
	}

	/**
	 * MDB2 Ingres statement driver
	 *
	 * @package MDB2
	 * @category Database
	 * @author  Paul Cooper <pgc@ucecom.com>
	 * @author  Lukas Smith <smith@pooteeweet.org>
	 * @author  Oliver Desmares <ingres@ascolteo.fr>
	 */
	class MDB2_Statement_ingres extends MDB2_Statement_Common
	{
		// {{{ _execute()

		/**
		 * Execute a prepared query statement helper method.
		 *
		 * @param mixed $result_class string which specifies which result class to use
		 * @param mixed $result_wrap_class string which specifies which class to wrap results in
		 * @return mixed a result handle or MDB2_OK on success, a MDB2 error on failure
		 * @access private
		 */
		function &_execute($result_class = true, $result_wrap_class = false)
		{
			if (is_null($this->statement)) {
				$result =& parent::_execute($result_class, $result_wrap_class);
				return $result;
			}
			$this->db->last_query = $this->query;
			$this->db->debug($this->query, 'execute', array('is_manip' => $this->is_manip, 'when' => 'pre', 'parameters' => $this->values));
			if ($this->db->getOption('disable_query')) {
				$result = $this->is_manip ? 0 : null;
				return $result;
			}

			$connection = $this->db->getConnection();
			if (PEAR::isError($connection)) {
				return $connection;
			}

			$query = false;
			$parameters = array();
			// todo: disabled until pg_execute() bytea issues are cleared up
			if (false || !function_exists('ingres_execute')) {
				$query = 'EXECUTE '.$this->statement;
			}
			if (!empty($this->positions)) {
				foreach ($this->positions as $parameter) {
					if (!array_key_exists($parameter, $this->values)) {
						return $this->db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                        'Unable to bind to missing placeholder: '.$parameter, __FUNCTION__);
					}
					$value = $this->values[$parameter];
					$type = array_key_exists($parameter, $this->types) ? $this->types[$parameter] : null;
					if (is_resource($value) || $type == 'clob' || $type == 'blob' || $this->db->options['lob_allow_url_include']) {
						if (!is_resource($value) && preg_match('/^(\w+:\/\/)(.*)$/', $value, $match)) {
							if ($match[1] == 'file://') {
								$value = $match[2];
							}
							$value = @fopen($value, 'r');
							$close = true;
						}
						if (is_resource($value)) {
							$data = '';
							while (!@feof($value)) {
								$data.= @fread($value, $this->db->options['lob_buffer_length']);
							}
							if ($close) {
								@fclose($value);
							}
							$value = $data;
						}
					}
					$quoted = $this->db->quote($value, $type, $query);
					if (PEAR::isError($quoted)) {
						return $quoted;
					}
					$parameters[] = $quoted;
				}
				if ($query) {
					$query.= ' ('.implode(', ', $parameters).')';
				}
			}
			if (!$query) {
				//            $result = ingres_execute($connection, $parameters);
				$result = ingres_query($connection,$this->query, $parameters);
				if (!$result) {
					$err =& $this->db->raiseError(null, null, null,
                    'Unable to execute statement', __FUNCTION__);
					return $err;
				}
			} else {
				$result = $this->db->_doQuery($query, $this->is_manip, $connection);
				if (PEAR::isError($result)) {
					return $result;
				}
			}

			if ($this->is_manip) {
				$affected_rows = $this->db->_affectedRows($connection, $result);
				return $affected_rows;
			}

			$result =& $this->db->_wrapResult($result, $this->result_types,
			$result_class, $result_wrap_class, $this->limit, $this->offset);
			$this->db->debug($this->query, 'execute', array('is_manip' => $this->is_manip, 'when' => 'post', 'result' => $result));
			return $result;
		}

		// }}}
		// {{{ free()

		/**
		 * Release resources allocated for the specified prepared query.
		 *
		 * @return mixed MDB2_OK on success, a MDB2 error on failure
		 * @access public
		 */
		function free()
		{
			if (is_null($this->positions)) {
				return $this->db->raiseError(MDB2_ERROR, null, null,
                'Prepared statement has already been freed', __FUNCTION__);
			}
			$result = MDB2_OK;

			if (!is_null($this->statement)) {
				$connection = $this->db->getConnection();
				if (PEAR::isError($connection)) {
					return $connection;
				}
				$query = 'DEALLOCATE PREPARE '.$this->statement;
				$result = $this->db->_doQuery($query, true, $connection);
			}

			parent::free();
			return $result;
		}
		
	}
	?>
